Whether you are a freelancer, sole trader, or registered business, knowing how to write a correct invoice for services rendered in Nigeria is a fundamental business skill. A proper invoice protects you legally, keeps your FIRS records clean, and — most importantly — gets you paid.
This guide walks you through every element of a Nigerian services invoice, step by step.
What Is an Invoice for Services Rendered?
An invoice for services rendered is a formal payment request issued after you have completed work for a client. Unlike a proforma invoice (which is sent before work begins) or a quotation (which is a price offer), a services invoice confirms that the work has been done and payment is now due.
Step-by-Step: How to Write a Services Invoice in Nigeria
Step 1: Add Your Business Information
At the top of the invoice, include:
- Full name or registered business name
- Business address (physical address, not just a P.O. Box)
- Phone number and email address
- Tax Identification Number (TIN) — mandatory if you are VAT-registered; recommended even if not
- CAC Registration Number — if your business is registered with the Corporate Affairs Commission
Step 2: Add the Client's Information
- Client's full name or company name
- Client's physical address
- Client's email and phone number
- Client's TIN — required for B2B invoices where the client will deduct WHT or claim input VAT
Step 3: Assign an Invoice Number and Date
- Invoice number — unique and sequential (e.g., INV-2026-022). Never reuse numbers.
- Invoice date — the date you issue the invoice
- Due date — the specific calendar date payment is expected (e.g., "Due: 25 March 2026")
Avoid vague terms like "Due on receipt" or "Net 30" without a specific date — these create ambiguity and delay payment.
Step 4: Describe the Services Rendered
This is the most important section. Be specific and itemised. Vague descriptions like "Services rendered — ₦200,000" invite disputes.
Good example: | Description | Qty | Rate | Amount | |---|---|---|---| | Brand strategy workshop facilitation (3-hour session, 10 Feb 2026) | 1 | ₦120,000 | ₦120,000 | | Competitor analysis report (delivered 20 Feb 2026) | 1 | ₦85,000 | ₦85,000 | | Brand positioning document (delivered 28 Feb 2026) | 1 | ₦95,000 | ₦95,000 | | Subtotal | | | ₦300,000 | | VAT (7.5%) | | | ₦22,500 | | Total Due | | | ₦322,500 |
Bad example:
Professional services — March 2026: ₦300,000
Step 5: Calculate and Show VAT
If you are VAT-registered with FIRS:
- Calculate VAT at 7.5% on the subtotal (before VAT)
- Show VAT as a separate line item — do not roll it into the total
- Your VAT registration number must appear on the invoice
If you are not VAT-registered, do not include a VAT line. Charging VAT without FIRS registration is a compliance violation.
Step 6: Add Payment Details
- Bank name
- Account number
- Account name (must match your registered business or personal name exactly)
- Or a Paystack payment link for instant card or bank transfer payment
Step 7: Add Payment Terms
State your terms clearly:
"Payment is due by 25 March 2026. Overdue balances attract interest at 3% per month. Please reference invoice number INV-2026-022 with your payment."
Step 8: Add Your Signature (Optional but Recommended)
For formal B2B invoices, a signature or stamp adds credibility. For digital invoices, your name and title is sufficient.
Free Services Invoice Template — Nigeria
INVOICE
[Your Business Name] [Address] | [Phone] | [Email] TIN: [Your TIN] | CAC No: [Your RC Number]
Invoice No: INV-2026-XXX Invoice Date: [Date] Due Date: [Due Date]
Bill To: [Client Name / Company] [Client Address] [Client TIN]
| Description | Qty | Rate (₦) | Amount (₦) | |---|---|---|---| | [Service description — be specific] | | | | | [Service description — be specific] | | | | | Subtotal | | | | | VAT (7.5%) | | | | | TOTAL DUE | | | |
Payment Details: Bank: [Bank Name] Account Number: [Account Number] Account Name: [Account Name]
Payment Terms: Payment due by [specific date]. Overdue balances attract 3% monthly interest.
Thank you for your business.
Common Mistakes on Nigerian Services Invoices
- No due date — "Payment due on receipt" is not enforceable. Use a specific date.
- Lump-sum description — always itemise; do not bundle services into one line
- Wrong VAT calculation — VAT is 7.5% of the subtotal, not of the total
- No invoice number — required by FIRS for VAT invoices; essential for record-keeping
- Missing TIN — if VAT-registered, your TIN must appear on every invoice
- No payment reference instruction — tell clients what reference to use so you can match incoming payments
Send Your Invoice via WhatsApp
Most Nigerian clients respond faster on WhatsApp than email. Save your invoice as a PDF and send it on WhatsApp — then follow up on email for formal documentation.
InvoiceGenerator.ng lets you create a professional services invoice in under 2 minutes, with automatic VAT calculation, Paystack payment links, and direct WhatsApp sharing.
For the full guide to Nigerian invoicing compliance, payment terms, and FIRS requirements, see our Nigerian Invoicing Guide.